CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's KVM module for ARM64 architecture, specifically in the handling of the virtual Generic Interrupt Controller (vgic-its) during the ITT save operation. An attacker can exploit this flaw by issuing a specific sequence of commands that leads to dereferencing a NULL pointer, causing the host to crash. Organizations utilizing KVM on ARM64 systems should prioritize addressing this vulnerability to prevent potential denial-of-service incidents during virtual machine migrations.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save MAPC with V=0 drops ite->collection but leaves the ITE on the device's ITT list, and vgic_its_save_ite() dereferences it unconditionally. A guest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the host when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it. That sequence is UNPREDICTABLE per the architecture, but KVM already handles the resulting state in the translate, MOVI and DISCARD paths. Save a zeroed entry, which vgic_its_restore_ite() reads back as invalid. Skipping the ITE instead would leave the ITT slot holding whatever is in guest memory, and restore rejects an entry naming a collection the restored collection table does not have.